Simulation of Temperature of R744/ R290 Refrigerant at Evaporator Outlet In Autocascade Refrigeration System

The objective of present work is to predict the temperature of refrigerant mixture at evaporator outlet using fuzzy modeling in autocascade refrigeration system. The fuzzy model is presented in this paper for the prediction refrigerant mixture temperature at evaporator outlet. The autocascade refrigeration system provides the possibility of keeping the highest pressure within a limit by selecting the composition of the refrigerant mixture as compared to vapor compression system which uses pure carbon dioxide. The refrigeration system uses R744/R290 as refrigerant mixture. Pressure (kPa), temperature (°C) and concentration of CO₂ are taken as input variable parameters for developing fuzzy model and the output is taken as the refrigerant mixture temperature at outlet of evaporator (°C). The model predictions are compared with a set of reliable experimental data available in the literature for the validation of fuzzy model and it is found that proposed fuzzy model gives the results which are well in agreement with experimental results.